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Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites
In the last year we have started a spectroscopic investigation ofasteroids located in the region of the main-belt between about 2.2 and3.6 AU. The aim of this work is to study the aqueous alteration processwhich acted in that zone, dominated by low albedo C-type asteroids, andto compare the spectra of these hydrous objects with those of CM2carbonaceous chondrite meteorites. In fact, the spectra of thesemeteorites reveal features probably due to aqueous altered materials ontheir surfaces. The study of the aqueous alteration process can giveimportant information on the chemical and thermal evolution of theearliest Solar System. More that 65% of the investigated objects haverevealed features suggesting the presence of hydrous materials. Thecomparison of the spectra of the hydrated asteroids obtained to datewith those of several CM2 carbonaceous chondrite meteorites seems toindicate that aqueous altered asteroids could be the parents of CM2meteorites. The data have been obtained during several observationalruns at the Asiago Observatory with the 1.8 m telescope and atESO-LaSilla with the 1.5 m telescope. Based on observations carried outat the European Southern Observatory (ESO), La Silla, Chile, and at theAsiago Observatory, Italy.
| Mesures de vitesses radiales. VIII. Accompagnement AU sol DU programme d'observation DU satellite HIPPARCOS
We publish 1879 radial velocities of stars distributed in 105 fields of4^{\circ} \times 4^{\circ}. We continue the PPO series \cite[(Fehrenbachet al. 1987;]{Feh87} \cite[Duflot et al. 1990, 1992 and 1995),]{Du90}using the Fehrenbach objective prism method. Table 1 only available inelectronic form at CDS via to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
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